On Saturday, the group searches the basement for artifacts. They find a 1933 photograph of the house staff. They also discover handmade doilies, crochet supplies, and an antique pedal-powered sewing machine. When Sonya tests it, Dobbs forces the pedal down and nearly stabs Sonya’s hand with the needle. They decide to create displays honoring the staff throughout the basement.

As September continues, the household spirits become visible more often. Sonya briefly spots Jerome, the groundskeeper, tipping his cap to her before vanishing. Trey expresses concern that both the friendly spirits and Dobbs are escalating and wants to confront Dobbs in the Gold Room, but Sonya asks him to wait until they have Astrid’s portrait.

Cleo finishes her autumn tree painting and shares illustrations for a horror novel she’s been working on. The chapter ends with Sonya receiving a digital media consultant contract from the Ryder group, a major client.

Cleo is working in her studio when Clover materializes with an urgent warning: Dobbs has Sonya trapped in the library and is hurting her. Cleo grabs a BB gun loaded with protective crystal beads her grandmother sent and rushes downstairs. The library doors resist, but with help from the spirits, she forces them open.

Inside, Dobbs has Sonya suspended near the ceiling, bleeding. When Dobbs turns on Cleo, she shoots her four times with the crystal-loaded BBs, causing Dobbs to scream and whirl into smoke. Sonya falls to the floor, injured but not seriously. When Trey and Owen arrive, they tend her bruises and discuss the attack. Sonya finds the crystal beads scattered on the library floor, now stained with Dobbs’s blood.

Over dinner, Trey proposes that if they do not have the rings or a clear path to them by October 31, all four of them will confront Dobbs in the Gold Room together.

They decorate the manor for Halloween. Sonya is drawn upstairs and finds Astrid’s portrait in a closet. When they hang it with the others, the rings on all seven portraits sparkle in sequence from last bride to first, revealing the key: Sonya and Owen must go through the mirror seven times to retrieve the rings in that order. That night, they finalize their plan for Samhain, a festival marking the end of the harvest season when the line between the living and the dead is thinnest. That night, Sonya has a terrifying nightmare about Dobbs.

Dobbs launches a major attack while Sonya and Trey are in the gym. They hear Cleo scream from upstairs and race to her room to find she was levitated in her sleep, dropped, and then attacked by Dobbs’s bird creature, which came through her open windows. She destroyed it by throwing her labradorite crystal ball through it, reducing it to foul-smelling smoke. Trey recovers the crystal outside, now coated in black ooze, and Cleo keeps it along with his stained shirt as potential weapons for their side.

In the days before Samhain, Sonya struggles with anxiety. Her father appears briefly as a corporeal spirit, telling her he loves and believes in her, and urging her to believe in herself. His visit restores her confidence. That evening, Trey proposes with a diamond ring, and Sonya says yes. The four celebrate with pizza and Cokes, review their plan one final time. Sonya and Owen go through the mirror at midnight to retrieve the first three rings—Johanna’s, Clover’s, and Lisbeth’s—returning each time weaker and more nauseated while Trey and Cleo guard against Dobbs’s escalating fury on their side. They push on to collect Agatha’s and Marianne’s rings as the manor bleeds, shakes, and rages around them.

The retrieval mission continues as Dobbs tears the manor apart. Sonya and Owen go through the mirror for Catherine’s ring, finding her sleepwalking toward the blizzard that will kill her. Sonya slips the ring from her hand and returns feeling stronger. For the final ring—Astrid’s, the first one stolen—the mirror won’t let Owen back through after Astrid shoves him out, leaving Sonya inside alone. She calms Astrid by describing moments from their history that only a true Poole descendant would know. Something shifts in Astrid, and she removes the ring herself, giving it freely and warning Sonya to hurry.

With all seven rings, Sonya is flooded with power. The four go outside to the seawall, where Cleo casts a circle of salt and they light candles. At 3:00 a.m., Dobbs appears as a corporeal woman walking toward her the spot where she first hurled herself from the turret. They must keep her from jumping while Cleo performs the ritual, burning cloth torn from Dobbs’s dress with Owen’s blood and seawater. Dobbs catches fire from her own wind and burns until nothing remains.

The seven brides appear together on the lawn. Sonya returns each ring, and the brides decide their futures, with most choosing to stay in the manor they loved. Clover races inside to find Charlie. The group climbs to the Gold Room, now just a dusty, empty room, and Sonya declares the house clean. In the newly freed space, she and Trey share the kiss that brings light back to Poole Manor.

In June, Sonya marries Trey in the manor gardens. She walks down the aisle with her mother, Winter, and feels her father’s presence beside them. The seven brides attend with their grooms, along with Molly and other manor spirits. Cleo, now wearing her own engagement ring from Owen, serves as maid of honor. Sonya and Trey exchange rings and vows, promising each other a lifetime together at the manor.